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Chemistry

Chemistry
Which one of the following has greatest mass ?

Electron
Hydrogen nucleus
Neutron
Proton

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Chemistry
The presence of ozone in the stratosphere is responsible for

Higher rate of photosynthesis
Supplying oxygen for people travelling in jets
Increasing the average global temperature in recent years
Checking the penetration of ultra-violet rays to the earth

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Chemistry
The source of energy that causes the least global warming is

Coal
Natural Gas
Petroleum
Geothermal energy

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Chemistry
When a metal is heated in a flame, the electrons absorb energy and jump to higher energy state. On coming back to the lower energy siate, they emit light, which we can observe in

Raman spectra
Absorption spectra
Emission spectra
Fluorescence

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Chemistry
The function of sedimentation tank in sewage treatment is to:

Disinfect the sewage
Remove water content
Remove suspended solids
Aerate the sewage

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Chemistry
The antiseptic compound present in dettol is

Cresol
Enloroxylenol
Iodine
Biothional

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MORE MCQ ON Chemistry

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